3种海拔对团竹生物量分配和克隆形态特征的影响

Location Effects from 3 Altitudes on Biomass Allocation and Cloning Morphology of Fargesia obliqua

通过对四川省北川县片口自然保护区不同海拔梯度下(2 700 m、2 800 m与2 900 m)团竹分株种群特征进行调查,研究其生物量分配格局和克隆形态特征。结果表明,(1)分株及构件生物量随海拔增加而增加;在不同海拔条件下,地下茎生物量分配有显著差异,其他构件生物量分配无明显差异;秆在构件生物量分配比值中最大,为38%;(2)地上构件形态特征随海拔升高而变化显著;地下构件中根的数量、地下茎基茎、地下茎长度和分蘖强度都随海拔升高呈现出先增加后减少的趋势,且在海拔2 800 m时达到最大值,因此宜选择海拔2 800 m地带的团竹苗用于人工种植。团竹在不同海拔环境中具有生物量分配和克隆形态的可塑性,有利于其种群对水分、光资源等的有效利用。

Biomass allocation and cloning morphology of Fargesia obliqua along with different altitudinal gradient （ from 2 007 m to 2 900 m） were examined in Piankou Nature Reserve of Beichuan County of Sichuan Province.The results showed that： （1） the biomass of ramets and modules increased along with increase of the altitude.There were no significant differences in biomass allocation except to the rhizome biomass allocation change at different alti-tude.The largest biomass was allocated to the stem, which was about 38%.（2） The morphological characteristics of aboveground modules varied significantly along with different altitude location.As underground modules were con-cerned, the root numbers, rhizome length and branching intensity of rhizome increased with the increase of elevation firstly, reached the maximum at the altitude of 2 800 m, and then decreased.These results exposed the plastic re-sponse of Fargesia obliqua to the biomass allocation and morphological features according to different altitude, which could directly facilitate light and water utilization by Fargesia obliqua.